The microstructures and microwave dielectric properties of the (1 - x)(Mg0.95Ni0.05)TiO3-xCa0.8Sm0.4/3TiO3 ceramics system were investigated in the range of 0.1 ≦ x ≦ 0.9. The quality factor (Q × f value) and the temperature coefficient (τf) of the specimens were decreased with increasing Ca0.8Sm0.4/3TiO3 content. The microstructures of (1 - x)(Mg0.95Ni0.05)TiO3-xCa0.8Sm0.4/3TiO3 ceramics were characterized using X-ray diffraction patterns and a scanning electron microscope (SEM). The areas of the various compositions in the ceramics were observed using energy dispersive spectroscopy (EDS), showing that Ca0.8Sm0.4/3TiO3 coexists with (Mg0.95Ni0.05)TiO3 in minor crystal grain. The existence of the Ca0.8Sm0.4/3TiO3 phase can inhibit the abnormal grain growth of the (Mg0.95Ni0.05)TiO3 phase. A relative permittivity (εr) of 22.9, a Q × f value of 92,000 GHz, and temperature coefficient of resonant frequency (τf) of -5.4 ppm/°C were obtained for 0.9(Mg0.95Ni0.05)TiO3-0.1Ca0.8Sm0.4/3TiO3 ceramics sintered at 1275 °C for 4 h.
All Science Journal Classification (ASJC) codes
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry